We propose a model of schooling that can account for the observed heterogeneity in workers' productivity and educational attainment. Identical unskilled agents can get a degree at a cost, but becoming skilled entails an additional unobservable effort cost. Individual labor can then be used as an...

This paper evaluates the efficiency implications of various fundamental tax reforms in an infinite-horizon endogenous growth model with public-sector investment in human capital. A fully optimal reform requires the government to adjust its expenditures on education, training, or R&D to take into...